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I passed your observation on to NiSi this evening. They'll be reviewing the tests shortly. I need to do a controlled test to see if there is a difference. I think I mentioned, when I lightly grade the clips, the results are very pleasing. Even the yellow cast on the Vari-ND at ND 1.8 comes up looking fine.

Rick,

It's an easy fix in post. Just bring down the green channel. Like I said in an earlier post, for the price range, they are good enough for me. I've learned that you have to spend mega bucks to get almost perfect quality and still, nothing is perfect. Let me know what they say.

The SLR Magic doesn't look that bad at max and 10. Add a Hoya IR/UV Cut filter to it and you're good. I know another guy who uses the SLR Magic to shoot music videos. He says he uses the Hoya with it and have no problems. I have the Tiffen Vari ND right now with the Formatt Hitech IR/UV Cut filter. I'll do tests this weekend with that set.

Didnít want this issue to be buried in the various threads that discuss the 4.6K sensor. Just posted this to the official BMD forum:

I have created a four part series from the tests i did 2017-03-04 to examine the control of infrared contamination on the URSA Mini 4.6K PL camera using a variety of filters.

Parts 1 and 2 feature IRND filters. The question was raised about combining the Mini Pro filters with additional ND filters to see if the Mini Pro filters will suffice to control infrared. Part 2 may answer that question for you as I present the three scenarios.

Part 1 examines just the 7 NiSi Nano IRND filters which behave in the same manner as the 3 built-in IRND filters found in the URSA Mini Pro cameras.

Part 2 examines the use of the SLR Magic Image Enhancer, B+W 486 MRC IR Cut, and S:R Magic Vari-ND filters alone or in combination with the NiSi filters to approximate how those filters may perform with the built-in IRND filters on the URSA Mini Pro camera. I canít be sure of course because i am not actually testing the Mini Pro.

Please read the additional notes for each video. Hope you find these tests useful. I also have simply graded all these clips and the results indicate that all clips appear to be quite good matches once they are corrected in post. I may present the graded videos if you want to see those, when I can upload them, but next week Iíll upload Part 3 and Part 4 that are specific to the SLR Magic Image Enhancer and the SLR Magic Vari-ND.

Edit:
Here is the Part 3 that isolates the SLR Magic Vari-ND II filter so you can judge its efficacy. It is not intended to affect infrared light, but you may see some changes in colour at the maximum setting. It is easily corrected in post.

Edit:
Here is Part 4 with the NiSi Nano 1.8 first and then with the SLR Magic Image Enhancer added for a subtle improvement to infrared filtration. The SLR Magic Image Enhancer shapes visible light and near infrared and then cuts infrared beyond the Ďnormalí cutoff on most IR Cut filters. I also added a distortion test of the 85mm APO and it looks good as a closeup lens (focus was 9.5í).

The first parts in this series are basically straight out of the camera except for Part 4 that had Auto Correct applied. My revision posted today to part 4 is graded using primaries only with the intent of matching those two clips, but careful examination can reveal some differences in the image as i expect. In the ungraded version, the blacks are slightly cleaner and the fave slightly warmer when the IE Pro is added. I use the iE Pro all the time though. if there’s a blue sky in the frame, the iE Pro doesn’t enhance that at all and I should add a bit of blue in post.

I don’t know who supplies BMD with the IRNDs used in the URSA Mini Pro, but I only used the Mini Nano IRNDs I have to illustrate that the approach BMD is following is sound and may be the only infrared filtration needed. There may be times when an additional filter, like the Image Enhancer Pro, or a traditional IR Cut will help, but that is more the exception now than the rule depending on your shooting conditions. I have to do these tests with tungsten that is a great source of infrared to see how the IRND and IE Pro perform, but I can’t get to that at this time. i think others will be posting their images from the URSA Mini Pro so demonstrating the efficacy of the high quality IRNDs will be evident shortly.